US20220371834A1 - Trapdoor rejection subsystem for a conveyor system - Google Patents
Trapdoor rejection subsystem for a conveyor system Download PDFInfo
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- US20220371834A1 US20220371834A1 US17/748,479 US202217748479A US2022371834A1 US 20220371834 A1 US20220371834 A1 US 20220371834A1 US 202217748479 A US202217748479 A US 202217748479A US 2022371834 A1 US2022371834 A1 US 2022371834A1
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- rejection mechanism
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- parcels
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/94—Devices for flexing or tilting travelling structures; Throw-off carriages
- B65G47/96—Devices for tilting links or platform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C3/00—Sorting according to destination
- B07C3/02—Apparatus characterised by the means used for distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
- B07C5/362—Separating or distributor mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G11/00—Chutes
- B65G11/12—Chutes pivotable
- B65G11/123—Chutes pivotable for articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/34—Devices for discharging articles or materials from conveyor
- B65G47/38—Devices for discharging articles or materials from conveyor by dumping, tripping, or releasing load carriers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/78—Troughs having discharge openings and closures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/02—Articles
- B65G2201/0285—Postal items, e.g. letters, parcels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/02—Control or detection
- B65G2203/0208—Control or detection relating to the transported articles
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- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/04—Detection means
- B65G2203/041—Camera
Definitions
- the present invention relates to the handling of parcels within a sorting or similar facility.
- the present invention relates to a trapdoor rejection subsystem which can be used in a conveyor system to selectively reject and redirect parcels.
- a sorting facility for parcels
- various parcels are unloaded from trucks or other vehicles at unloading locations, sorted, and then loaded onto trucks or other vehicles at loading locations for delivery to the intended recipients.
- a robot singulator including a robotic framework (comprised of one or more arms) and an end effector, such as a vacuum-based end effector, that is mounted to the distal end of the robotic framework and configured to engage parcels.
- a number of different robot singulators exist in the art, such as those disclosed in commonly assigned U.S. Pat. Nos. 10,646,898 and 10,994,309, which are incorporated herein by reference.
- the first step is often to transform the bulk flow into a singulated flow of parcels in which the parcels are positioned at substantially equal intervals and aligned (i.e., in a single file line) along a conveyor for subsequent processing.
- singulators exist in the art, many of which employ various combinations of belt conveyors and/or roller conveyors to achieve the desired singulation of the parcels.
- a surge in the volume of parcels may overwhelm the mechanical systems, and parcels may not be fully singulated. Non-singulated parcels may then interfere with subsequent processing, including downstream sorting.
- U.S. Pat. Nos. 10,646,898 and 10,994,309 thus describe a system and method for identifying and transferring parcels from a bulk flow of parcels on the first conveyor (or “pick conveyor”) to a singulated stream of parcels on the second conveyor (or “place conveyor”).
- a robot singulator or robot receives parcels via the pick conveyor, engages each parcel, and then places it onto the place conveyor in response to instructions from a vision and control subsystem.
- conveyor systems including only a single robot singulator may not always be capable of providing the necessary throughput required to efficiently process large parcel volumes.
- U.S. Patent Application Publication No. 2021/0395023 which is also incorporated herein by reference, describes another conveyor system, which includes multiple robot singulators (or robots) for transferring parcels from a bulk flow into a singulated stream of parcels.
- a pick conveyor (which can include any form of chute, conveyor, or conveying surface, whether static or moving, that defines a “picking area”) is configured to receive a bulk flow of parcels, and a place conveyor is positioned downstream of the pick conveyor.
- a first robot singulator (or first robot) and a second robot singulator (or second robot) work in parallel to transfer parcels within a picking area of the pick conveyor into a singulated stream on the place conveyor in response to instructions from a vision and control subsystem that is operably connected to the pick conveyor, the first robot, and the second robot.
- the robots may not be able to engage certain parcels.
- certain parcels may exceed size and/or weight limitations or otherwise may be characterized as “unconveyable.”
- the vision and control subsystem may not be able to accurately identify a parcel because of a “hidden” edge or other anomaly that makes it difficult to identify the parcel.
- a rejection mechanism to handle those parcels that cannot be readily transferred from the first conveyor to the second conveyor.
- U.S. Pat. No. 11,014,767 which is also incorporated herein by reference, describes a rejection mechanism for a conveyor system, which pushes parcels across and off of an upper surface of a conveyor.
- the rejection mechanism includes a linear actuator and a paddle mounted to the linear actuator for movement between a first position and a second position.
- the paddle includes a bracket portion, an upright portion, and a lateral wall portion.
- the lateral wall portion is configured to push parcels across a surface positioned below the lateral wall portion as the paddle is moved from the first position to the second position.
- the present invention is a trapdoor rejection subsystem for a conveyor system.
- a trapdoor rejection subsystem includes one or more trapdoor rejection mechanisms, with each trapdoor rejection mechanism configured to be selectively transitioned between a closed position and an open position.
- each respective trapdoor rejection mechanism of the trapdoor rejection subsystem is ordinarily in the closed position to temporarily support parcels directed to the trapdoor rejection mechanism prior to subsequent transfer (e.g., by a robot singulator), but can selectively be transitioned to the open position to cause parcels identified as “unconveyable” to pass through the trapdoor rejection mechanism.
- each trapdoor rejection mechanism of the trapdoor rejection subsystem includes: a first door mounted to a first shaft; a second door mounted to a second shaft; and one or more actuators which can be selectively actuated to rotate the first shaft and the second shaft, and thus the first door and second door mounted thereto, to transition the trapdoor rejection mechanism between the closed position and the open position.
- each trapdoor rejection mechanism includes a single actuator.
- each trapdoor rejection mechanism further includes a linkage assembly, which interconnects and facilitates simultaneous rotation of the first shaft and the second shaft.
- the linkage assembly of each trapdoor rejection mechanism includes: a first pivot arm mounted to the first shaft, such that in use, the first shaft is rotated in response to the rotation of the first pivot arm; a second pivot arm mounted to the second shaft, such that, in use, the second shaft is rotated in response to rotation of the second pivot arm; and a rod that connects the first pivot arm to the second pivot arm, such that, in use, rotation of the first pivot arm results in simultaneous rotation of the second pivot arm.
- each trapdoor rejection mechanism of the trapdoor rejection subassembly includes a frame to which the first shaft and the second shaft are mounted.
- the frame defines a wall that partially surrounds the first door and the second door to prevent parcels transferred to the trapdoor rejection mechanism from inadvertently falling off of the trapdoor rejection mechanism.
- the first door and the second door of each trapdoor rejection mechanism are positioned opposite of each other so that the first door and the second door move in opposite directions in response to first shaft and the second shaft being rotated in the same rotational direction.
- An exemplary conveyor system which includes a trapdoor rejection subsystem made in accordance with the present invention, includes: one or more robot singulators; an upstream conveyor for carrying a bulk flow of parcels; one or more trapdoor rejection mechanisms; a place conveyor; and a vision and control subsystem that is operably connected to the one or more robot singulators and the trapdoor rejection mechanism.
- the vision and control subsystem includes: a camera for acquiring one or more images of a picking area defined by the one or more trapdoor rejection mechanisms and any parcels located in the picking area; and a controller.
- the controller is configured to receive and process image data corresponding to the one or more images of the picking area acquired by the camera to determine whether a parcel located in the picking area is conveyable or unconveyable.
- a parcel may be considered to be unconveyable when the parcel in the picking area exceeds certain predetermined dimensions, is of a certain shape, is labeled with certain indicia, and/or has an obstructed edge or other anomaly which makes it difficult for the vision and control subsystem to identify the shape or dimensions of the parcel.
- the controller In response to determining the parcel in the picking area is conveyable, the controller is configured to communicate instructions to the one or more robot singulators which cause the one or more robot singulators to engage and transfer the parcel in the picking area from the picking area to the place conveyor. In response to determining the parcel in the picking area is unconveyable, the controller is configured to communicate instructions which cause one of the trapdoor rejection mechanisms to transition from the closed position to the open position, allowing unconveyable parcel to fall through and effectively removing the unconveyable parcel as a potential candidate for transfer by the one or more robots.
- a first door of the trapdoor rejection mechanism extends upwardly, and a second door of the trapdoor rejection mechanism extends downwardly, when the trapdoor rejection mechanism is in the open position.
- the trapdoor rejection mechanism is positioned adjacent to a distal end of the upstream conveyor, such that the first door of the trapdoor rejection mechanism defines a wall that blockades parcels from the bulk flow of parcels on the upstream conveyor when the trapdoor rejection mechanism is in the open position.
- the conveyor system also includes a hinge that is secured to the upstream conveyor and the trapdoor rejection mechanism to bridge a gap between the upstream conveyor and the trapdoor rejection mechanism, preventing parcels from falling through the gap.
- the conveyor system includes a sensor that is operably connected to the vision and control subsystem.
- the sensor is positioned to detect the presence of a parcel which has become hung on a door of the trapdoor rejection mechanism and to obtain readings regarding the same.
- the controller communicates instructions which cause a display operably connected to the vision and control subsystem to display a visual cue and/or a speaker operably connected to the vision and control subsystem to emit an audible cue.
- the sensor is a photoelectric sensor. In some embodiments, the sensor is the camera of the vision and control subsystem.
- FIG. 1 is a perspective view of a conveyor system, including an exemplary trapdoor rejection subsystem made in accordance with the present invention
- FIG. 2A is a perspective view of a trapdoor rejection mechanism of the exemplary trapdoor rejection subsystem of FIG. 1 , with the trapdoor rejection mechanism in a closed position;
- FIG. 2B is a perspective view of the trapdoor rejection mechanism similar to FIG. 2A , but with the trapdoor rejection mechanism in an open position;
- FIG. 3 is another perspective view of the trapdoor rejection mechanism similar to FIG. 2A , but with an actuator of the trapdoor rejection mechanism removed;
- FIG. 4 is an alternate perspective view of an upstream conveyor and the exemplary trapdoor rejection subsystem of FIG. 1 , but with certain components removed;
- FIG. 5 is a sectional view of the upstream conveyor and the exemplary trapdoor rejection subsystem taken along line 5 - 5 of FIG. 4 ;
- FIG. 6 is a schematic diagram of a vision and control subsystem, along with certain components of the conveyor system and the exemplary trapdoor rejection subsystem which may be controlled by the vision and control subsystem and/or provide information to the vision and control subsystem.
- the present invention is a trapdoor rejection subsystem for a conveyor system.
- FIG. 1 is a perspective view of a conveyor system 10 , including an exemplary trapdoor rejection subsystem 100 made in accordance with the present invention.
- the conveyor system 10 generally includes: an upstream conveyor 14 configured to receive and deliver a bulk flow of parcels (not shown), which, in this case, is a bulk feed chute that is split into two sections at its distal end to direct parcels to a first picking area 102 a and a second picking area 102 b that are defined by the trapdoor rejection subsystem 100 , as further described below; a place conveyor 16 positioned downstream of the upstream conveyor 14 , which, in this case, includes a first place area 16 a , a second place area 16 b , and an buffering conveyor 16 c positioned between the first place area 16 a and the second place area 16 b ; a first robot singulator 20 (or first robot 20 ) and a second robot singulator 22 (or second robot 22 ), which work in parallel to transfer parcels from the first picking area 102 a and the second picking area 102 b into a singulated stream on the place conveyor 16 ; and a vision and control subsystem 30 that is oper
- the conveyor system 10 further includes the exemplary trapdoor rejection subsystem 100 , which comprises one or more trapdoor rejection mechanisms 100 a , 100 b .
- Each trapdoor rejection mechanism 100 a , 100 b of the trapdoor rejection subsystem 100 is configured to be selectively transitioned (or moved) between a closed position and an open position.
- each respective trapdoor rejection mechanism 100 a , 100 b of the trapdoor rejection subsystem 100 is ordinarily in the closed position to temporarily support parcels directed to the trapdoor rejection mechanism 100 a , 100 b from the upstream conveyor 14 prior to being engaged by the first robot 20 or the second robot 22 and transferred to the place conveyor 16 .
- the trapdoor rejection mechanism 100 a , 100 b on which the unconveyable parcel is positioned can be actuated and transitioned to the open position, which causes the unconveyable parcel to pass through the trapdoor rejection mechanism 100 a , 100 b .
- the unconveyable parcel is effectively rejected and redirected out of the stream of parcels to be processed by the first robot 20 and the second robot 22 , thus effectively removing the unconveyable parcel as a potential candidate for transfer by the first robot 20 or the second robot 22 .
- unconveyable parcels rejected in the foregoing manner may be captured in a temporary storage bin (not shown) or redirected elsewhere via another conveyor (not shown) positioned below the trapdoor rejection subsystem 100 .
- the detection of “unconveyable” parcels and the transition of each trapdoor rejection mechanism 100 a , 100 b of the trapdoor rejection subsystem 100 may be regulated by the vision and control subsystem 30 .
- the trapdoor rejection subsystem 100 is positioned directly adjacent to the distal end 14 a ( FIG. 5 ) of the upstream conveyor 14 so that parcels offloaded from the upstream conveyor 14 are directed to the trapdoor rejection subsystem 100 .
- the trapdoor rejection subsystem 100 actually comprises two separate trapdoor rejection mechanisms: a first trapdoor rejection mechanism 100 a , which defines the first picking area 102 a and is shown in the open position in FIG. 1 ; and a second trapdoor rejection mechanism 100 b , which defines the second picking area 102 b and is shown in the closed position in FIG. 1 .
- the trapdoor rejection subsystem 100 may be integrated into the upstream conveyor 14 by virtue of each trapdoor rejection mechanism 100 a , 100 b of the trapdoor rejection subsystem 100 either being secured to or integrally formed with the upstream conveyor 14 .
- each trapdoor rejection mechanism 100 a , 100 b of the trapdoor rejection subsystem 100 either being secured to or integrally formed with the upstream conveyor 14 .
- fewer (one) or more trapdoor rejection mechanisms could be part of the trapdoor rejection subsystem 100 without departing from the spirit and scope of the present invention.
- FIGS. 2A and 2B are perspective views of the first trapdoor rejection mechanism 100 a in the closed position and in the open position, respectively.
- FIG. 3 is a perspective view of the first trapdoor rejection system 100 a similar to FIG. 2A , but with an actuator 130 of the first trapdoor rejection mechanism 100 a removed to better illustrate other components of the first trapdoor rejection mechanism 100 a
- the first trapdoor rejection mechanism 100 a generally includes a first door 110 , a second door 120 , and one or more actuators 130 which can be selectively actuated to rotate the first door 110 and the second door 120 to transition the first trapdoor rejection mechanism 100 a between the closed position ( FIGS. 2A and 3 ) and the open position ( FIG. 2B ).
- the first trapdoor rejection mechanism 100 a includes two doors: a first door 110 that is mounted to a first shaft 112 , such that rotation of the first shaft 112 results in rotation of the first door 110 ; and a second door 120 that is mounted to a second shaft 122 , such that rotation of the second shaft 122 results in rotation of the second door 120 .
- the first door 110 and the second door 120 can be rotated to transition the first trapdoor rejection mechanism 100 a between the closed position ( FIGS. 2A and 3 ) and the open position ( FIG. 2B ).
- the first door 110 and the second door 120 collectively form a surface in the first picking area 102 a , upon which parcels directed off of the upstream conveyor 14 can temporarily rest prior to either being transferred to the place conveyor 16 or passed through the first trapdoor rejection mechanism 100 a as a result of the first trapdoor rejection mechanism being transitioned to the open position.
- the first trapdoor rejection mechanism 100 a further includes a frame 104 to which the first shaft 112 and the second shaft 122 are mounted via a first pair of bearings 103 , 105 and a second pair of bearings 108 (one of which is shown in FIGS. 2A, 2B, and 3 ), respectively.
- the first pair of bearings 103 , 105 and the second pair of bearings 108 are pillow block bearings.
- the frame 104 may include a set of legs 104 a ( FIG. 1 ) and/or be mounted to another structure, such as the upstream conveyor 14 .
- the frame 104 in some implementations, may serve as a convenient point of attachment which facilitates integration of the first trapdoor rejection mechanism into upstream conveyor 14 .
- the frame 104 defines a wall 104 b that partially surrounds the first door 110 and the second door 120 .
- the first trapdoor rejection mechanism 100 a further includes a linkage assembly which interconnects and facilitates simultaneous rotation of the first shaft 112 and the second shaft 122 .
- the linkage assembly includes: a first pivot arm 114 , a second pivot arm 124 , and a rod 126 that interconnects the first pivot arm 114 and the second pivot arm 124 .
- the first pivot arm 114 is mounted to the first shaft 112 , such that the first shaft 112 is rotated in response to rotation of the first pivot arm 114 and vice versa.
- the second pivot arm 124 is mounted to the second shaft 122 , such that the second shaft 122 is rotated in response to rotation of the second pivot arm 124 and vice versa.
- the rod 126 is connected to the first pivot arm 114 and the second pivot arm 124 , such that rotation of the first pivot arm 114 results in simultaneous rotation of the second pivot arm 124 , and vice versa.
- the rod 126 is connected to the first pivot arm 114 and the second pivot arm 124 so that the first pivot arm 114 and the second pivot arm 124 simultaneously rotate in the same rotational direction (i.e., clockwise or counterclockwise) as each other.
- the first door 110 and the second door 120 are positioned opposite of each other and mounted to opposing ends of the frame 104 , such that the distal edge 110 a of the first door 110 and the distal edge 120 a of the second door 120 are adjacent to each other, and the first shaft 112 and the second shaft 122 are parallel to each other. Accordingly, as a result of such construction and the linkage assembly interconnecting the first shaft 112 and the second shaft 122 , rotation of the first pivot arm 114 and the second pivot arm 124 in the same rotational direction causes the first door 110 and the second door 120 to move (or open) in different directions, as evidenced by viewing FIGS. 2A and 2B in sequence. Specifically, in this exemplary embodiment, one door moves up while the other door moves down as the first shaft 112 and the second shaft 122 are rotated in the same rotational direction.
- the first door 110 is in a vertical, upwardly extending position
- the second door 120 is in a vertical, downwardly extending position, when the first trapdoor rejection mechanism 100 a is in the open position, the importance of which is further described below.
- the first trapdoor rejection mechanism 100 a comprises a single actuator 130 , which, in this case, is a gear motor mounted to drive rotation of the first pivot arm 114 in two rotational directions (i.e., clockwise and counterclockwise).
- the first shaft 112 is operably connected to the actuator 130 via the first pivot arm 114 .
- Actuation of the actuator 130 results in rotation of the first pivot arm 114 , which, of course, causes rotation of the first shaft 112 to transition the first door 110 from a closed position ( FIG. 2A ) to an open position ( FIG. 2B ), or vice versa.
- actuation of the actuator 130 also results in rotation of the second pivot arm 124 , which, of course, causes rotation of the second shaft 122 to transition the second door 120 from a closed position ( FIG. 2A ) to an open position ( FIG. 2B ), or vice versa.
- the gear motor is only one of many known actuators that could be used to rotate the first shaft 112 and the second shaft 122 in the above-described manner.
- suitable actuators include, but are not limited to, pneumatic cylinders, hydraulic cylinders, and/or electric linear actuators.
- the actuator 130 is primarily referred to herein as driving rotation of the first pivot arm 114 , alternative embodiments are contemplated in which the actuator 130 is mounted to drive rotation of the first shaft 112 directly
- the second trapdoor rejection mechanism 100 b is of identical construction and thus functions and can be controlled in the same manner as described herein for the first trapdoor rejection mechanism 100 a.
- FIG. 6 is a schematic diagram of the vision and control subsystem 30 , along with certain components of the conveyor system 10 and trapdoor rejection subsystem 100 which may be controlled by the vision and control subsystem 30 and/or provide information to the vision and control subsystem 30 .
- the vision and control subsystem 30 generally includes: one or more cameras 52 , 54 that are configured to acquire two-dimensional and/or three-dimensional images of the first picking area 102 a , the second picking area 102 b , and any parcels located therein; and a controller 40 .
- the vision and control subsystem 30 includes two cameras: a first camera 52 , which is positioned so that the field of view of the first camera 52 includes the first picking area 102 a ; and a second camera 54 , which is positioned so that the field of view of the second camera 54 includes the second picking area 102 b .
- the first camera 52 and the second camera 54 are operably connected to the controller 40 , such that the controller 40 can communicate instructions to, and receive image data from, the first camera 52 and the second camera 54 .
- the first camera 52 and the second camera 54 may be selectively activated to capture images of the first picking area 102 a and the second picking area 102 b , respectively, in response to instructions (or signals) communicated from the controller 40 or obtain images substantially continuously.
- the images captured by the first camera 52 and the second camera 54 are communicated to the controller 40 as image data. In other words, the images captured by the first camera 52 and the second camera 54 are not processed prior to being communicated to the controller 40 .
- Embodiments are, however, contemplated in which the first camera 52 and the second camera 54 are individual components of one or more larger vision units, as disclosed, for example, in U.S. Patent Application Publication No. 2021/0395023, which, again, is incorporated herein by reference.
- the images acquired by the first camera 52 and the second camera 54 may be processed locally on one or more vision units to generate the image data which is subsequently communicated to the controller 40 for processing.
- Suitable cameras for use in the vision and control subsystem 30 include three-dimensional image sensors manufactured and distributed by ifm Effector Inc. of Malvern, Pa.
- the controller 40 includes a processor 42 configured to execute instructions stored in a memory component 44 or other computer-readable medium.
- the controller 40 is a programmable logic controller or other industrial controller.
- the controller 40 is connected to the first camera 52 and the second camera 54 to facilitate the transmission of image data from the first camera 52 and the second camera 54 to the controller 40 either by wired connection (e.g., Ethernet connection) or by wireless connection (e.g., via a network) using known interfaces and protocols.
- wired connection e.g., Ethernet connection
- wireless connection e.g., via a network
- the image data received from the first camera 52 and the second camera 54 is processed by the controller 40 to determine whether a parcel located in the picking area to which the image corresponds is “unconveyable” and should be removed as a candidate for transfer by the first robot 20 or the second robot 22 .
- a parcel is considered to be “unconveyable” when the parcel exceeds certain predetermined dimensions, is of a certain shape, is labeled with certain indicia, and/or has an obstructed (or “hidden”) edge or other anomaly which makes it difficult for the vision and control subsystem 30 to identify the shape or dimensions of the parcel. It is appreciated, however, that the criteria by which a parcel is deemed “unconveyable” may be modified to better accommodate different sorting applications and/or environments without departing from the spirit and scope of the present invention.
- the controller 40 is also operably connected to the actuators 130 , 132 of the first trapdoor rejection mechanism 100 a and the second trapdoor rejection mechanism 100 b , such that the actuator 130 of the first trapdoor rejection mechanism 100 a and the actuator 132 of the second trapdoor rejection mechanism 100 b can be selectively actuated in response to instructions (or signals) communicated from the controller 40 .
- the controller 40 Upon determining a parcel located in the first picking area 102 a is unconveyable, the controller 40 communicates instructions to the first trapdoor rejection mechanism 100 a which actuates the actuator 130 of the first trapdoor rejection mechanism 100 a and transitions the first trapdoor rejection mechanism 100 a to the open position.
- the controller 40 communicates instructions to the second trapdoor rejection mechanism 100 b which actuates the actuator 132 of the second trapdoor rejection mechanism 100 b and transitions the second trapdoor rejection mechanism 100 b to the open position. If, however, the parcel in the first picking area 102 a and the parcel located in the second picking area 102 b are not determined to be unconveyable (i.e., a determination that the parcel is conveyable), the vision and control subsystem 30 communicates instructions to either the first robot 20 or the second robot to 22 to transfer such parcels to the first place area 16 a or the second place area 16 b of the place conveyor 16 .
- the place conveyor 16 is actually comprised of multiple conveyors, each of which can be selectively activated to transfer singulated parcels downstream for subsequent processing.
- the place conveyor 16 includes: a first conveyor which defines the first place area 16 a ; a second conveyor which defines the second place area 16 b ; and a third (or buffering) conveyor 16 c positioned between the first conveyor and the second conveyor.
- the buffering conveyor 16 c can be selectively activated to regulate the rate at which parcels offloaded from the first place area 16 a are subsequently transferred to the second place area 16 b.
- the controller 40 is also operably connected to the first robot 20 and the second robot 22 , such that the controller 40 can communicate instructions (or signals) to control operation of the first robot 20 and the second robot 22 .
- the controller 40 may also be operably connected to the buffering conveyor 16 c , such that the controller 40 can communicate instructions (or signals) to control operation of the buffering conveyor 16 c.
- FIG. 4 is an alternate perspective view of an upstream conveyor 14 and the exemplary trapdoor rejection subsystem 100 of FIG. 1 , but the place conveyor 16 , the first robot singulator 20 , the second robot singulator 22 , and the framework supporting the first robot singulator 20 and the second robot singulator 22 have been removed to better illustrate other components of the trapdoor rejection subsystem 100 .
- FIG. 5 is a sectional view of the upstream conveyor and the exemplary trapdoor rejection subsystem taken along line 5 - 5 of FIG. 4 .
- the first trapdoor rejection mechanism 100 a and the second trapdoor rejection mechanism 100 b are positioned so that the first door 110 of each trapdoor rejection mechanism 100 a , 100 b is positioned adjacent to the distal end 14 a of the upstream conveyor 14 .
- the first door 110 is in a vertical, upwardly extending position which effectively defines a wall that blockades and prevents upstream parcels located on the upstream conveyor 14 from inadvertently transitioning off of the upstream conveyor 14 and through the trapdoor rejection subsystem 100 .
- the controller 40 communicates instructions (or signals) which actuate the actuator 130 to return the first trapdoor rejection mechanism 100 a back to the closed position so that upstream parcels subsequently directed to the first picking area 102 a from the upstream conveyor 14 can be transferred to the place conveyor 16 or rejected in the above-described manner.
- the controller 40 communicates instructions (or signals) which actuate the actuator 132 of the second trapdoor rejection mechanism 100 b to return the second trapdoor rejection mechanism 100 b to the closed position so that upstream parcels subsequently directed to the second picking area 102 b from the upstream conveyor 14 can be transferred to the place conveyor 16 or rejected in the above-described manner.
- the communication of instructions (or signals) by the controller 40 to return the first trapdoor rejection mechanism 100 a or the second trapdoor rejection mechanism 100 b to the closed position may occur automatically (e.g., after a predetermined time period after being transitioned to the open position) or after a verification step performed by the vision and control subsystem 30 , as further described below.
- each respective trapdoor rejection mechanism 100 a , 100 b As evidenced by the second trapdoor rejection mechanism 100 b in FIG. 4 , as the first door 110 of each respective trapdoor rejection mechanism 100 a , 100 b is transitioned to the open position, parcels of flexible construction (e.g., flexible plastic or “poly” bags) may be raised and subsequently become “hung” on (i.e., rest on top of) the first door 110 . As the respective trapdoor rejection mechanisms 100 a , 100 b are returned to the closed position, parcels hung on the first door 110 may inadvertently fall below the trapdoor rejection subsystem 100 or prevent the first door 110 and the second door 120 from closing correctly.
- flexible construction e.g., flexible plastic or “poly” bags
- the vision and control subsystem 30 preferably verifies that no parcels are hung and that the doors of the respective trapdoor rejection mechanisms 100 a , 100 b can be closed without issue.
- the conveyor system 10 further includes a sensor 150 ( FIGS. 1 and 6 ), such as a photoelectric sensor, to detect when a parcel becomes hung in the above-described manner.
- the sensor 150 is configured and positioned to detect instances in which a parcel rests on top of the first door 110 of the respective trapdoor rejection mechanisms 100 a , 100 b when in the open position and obtain readings indicative of the same.
- each respective trapdoor rejection mechanism 100 a , 100 b is provided with its own sensor, although only a single sensor 150 is shown in the drawings. Accordingly, in this exemplary embodiment, the sensor 150 actually comprises multiple sensors that are distributed throughout the conveyor system 10 . In an alternative embodiment, instead of a photoelectric sensor, the sensor 150 comprises one or more cameras 52 , 54 of the vision and control subsystem 30 .
- the sensor 150 is operably connected to the vision and control subsystem 30 , such that readings obtained by the sensor 150 are transmitted to a controller 40 of the vision and control subsystem 30 for subsequent processing.
- the sensor 150 may be selectively activated to obtain readings in response to instructions (or signals) communicated from the controller 40 of the vision and control subsystem 30 or obtain readings substantially continuously.
- the controller 40 is configured to generate an alarm to notify an operator of such occurrence.
- the alarm generated by the controller 40 is in the form of a visual cue which is displayed on a display 170 that is operably connected to the controller 40 of the vision and control subsystem 30 and/or an audible cue which is emitted from a speaker 160 that is operably connected to the controller 40 of the vision and control subsystem 30 .
- the controller 40 preferably waits to communicate instructions to the actuator 130 , 132 of that trapdoor rejection mechanism 100 a , 100 b to return to the closed position until the controller 40 receives a reading from the sensor 150 indicating that the parcel is no longer hung.
- the conveyor system 10 further includes a hinge 15 a , 15 b which bridges a gap 17 ( FIG. 5 ) existing between the distal end 14 a of the upstream conveyor 14 and the trapdoor rejection subsystem 100 to prevent smaller parcels (e.g., flat envelops) from falling through the gap 17 during operation of the conveyor system 10 .
- a hinge 15 a , 15 b which bridges a gap 17 ( FIG. 5 ) existing between the distal end 14 a of the upstream conveyor 14 and the trapdoor rejection subsystem 100 to prevent smaller parcels (e.g., flat envelops) from falling through the gap 17 during operation of the conveyor system 10 .
- the hinge 15 a , 15 b actually comprises two separate hinges: a first hinge 15 a which is secured to and extends between the distal end 14 a of the upstream conveyor 14 and the first trapdoor rejection mechanism 100 a ; and a second hinge 15 b which is secured to and extends between the distal end 14 a of the upstream conveyor 14 and the second trapdoor rejection mechanism 100 b .
- the first hinge 15 a is secured to an underside of the distal end 14 a of the upstream conveyor 14 and the first door 110 of the first trapdoor rejection mechanism 100 a .
- the second hinge 15 b is similarly secured with respect to the distal end 14 a of the upstream conveyor and the second trapdoor rejection mechanism 100 b .
- the length of the first hinge 15 a and the second hinge 15 b in combination, is coextensive with the length of the gap 17 existing between the distal end 14 a of the upstream conveyor 14 and the trapdoor rejection subsystem 100 .
- Alternative embodiments are, however, contemplated in which the length of the first hinge 15 a and the second hinge 15 b , in combination, only extends a portion of the length of the gap 17 , while still effectively preventing parcels from falling through the gap 17 .
- first hinge 15 a and the second hinge 15 b are comprised of multiple interlocking segments which define a plurality of joints that may be manipulated as the trapdoor rejection mechanism 100 a , 100 b to which it is secured opens and closes.
- first hinge 15 a and the second hinge 15 b may be constructed of a rigid plastic or flexible rubber.
- first hinge 15 a and the second hinge 15 b may be constructed in a similar manner to the transfer plate that is described in U.S. Pat. No. 10,654,652, which is incorporated herein by reference.
- the trapdoor rejection subsystem 100 of the present invention is not limited to such a configuration. Rather, the trapdoor rejection subsystem 100 of the present invention could be incorporated into various other conveyor systems, including conveyor systems which utilize only a single robot singulator, without departing from the spirit or scope of the present invention. Suitable, alternative conveying systems in which the trapdoor rejection subsystem 100 may be incorporated include, but is not limited to, the conveyor system described in U.S. Pat. No. 10,646,898 (which uses a single robot for singulation).
- the trapdoor rejection subsystem 100 is primarily referred to herein in the context of comprising multiple trapdoor rejection mechanisms 100 a , 100 b , it is appreciated that, in alternative embodiments, the trapdoor rejection subsystem 100 may include only a single trapdoor rejection mechanism and still fall within the spirit and scope of the present invention.
- the upstream conveyor 14 is sometimes referred to herein and illustrated within the drawings as a bulk feed chute, it should be appreciated that the upstream conveyor 14 is not so limited. Rather, in some embodiments, instead of a bulk feed chute, the upstream conveyor 14 comprises a different conveying mechanism, such as one or more belt or roller conveyors.
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Abstract
Description
- The present application claims priority to U.S. Patent Application Ser. No. 63/191,179 filed on May 20, 2021, and U.S. Patent Application Ser. No. 63/251,124, filed on Oct. 1, 2021, the entire disclosures of which are incorporated herein by reference.
- The present invention relates to the handling of parcels within a sorting or similar facility. In particular, the present invention relates to a trapdoor rejection subsystem which can be used in a conveyor system to selectively reject and redirect parcels.
- In a sorting facility for parcels, various parcels are unloaded from trucks or other vehicles at unloading locations, sorted, and then loaded onto trucks or other vehicles at loading locations for delivery to the intended recipients. Thus, within the sorting facility, there is often a complex system of conveyors and equipment that facilitates transport and sorting of the parcels within the facility. One such piece of equipment useful for sorting the various parcels is a robot singulator, including a robotic framework (comprised of one or more arms) and an end effector, such as a vacuum-based end effector, that is mounted to the distal end of the robotic framework and configured to engage parcels. In this regard, a number of different robot singulators exist in the art, such as those disclosed in commonly assigned U.S. Pat. Nos. 10,646,898 and 10,994,309, which are incorporated herein by reference.
- When first introduced into the system of conveyors and equipment, the parcels are randomly positioned on a conveyor in a “bulk flow.” Thus, within the sorting facility, the first step is often to transform the bulk flow into a singulated flow of parcels in which the parcels are positioned at substantially equal intervals and aligned (i.e., in a single file line) along a conveyor for subsequent processing. A wide variety of singulators exist in the art, many of which employ various combinations of belt conveyors and/or roller conveyors to achieve the desired singulation of the parcels. However, there are certain deficiencies in such prior art systems. For example, a surge in the volume of parcels may overwhelm the mechanical systems, and parcels may not be fully singulated. Non-singulated parcels may then interfere with subsequent processing, including downstream sorting.
- U.S. Pat. Nos. 10,646,898 and 10,994,309 thus describe a system and method for identifying and transferring parcels from a bulk flow of parcels on the first conveyor (or “pick conveyor”) to a singulated stream of parcels on the second conveyor (or “place conveyor”). Specifically, a robot singulator (or robot) receives parcels via the pick conveyor, engages each parcel, and then places it onto the place conveyor in response to instructions from a vision and control subsystem. However, due to cycle time limitations (i.e., the time required for each iterative transfer of a parcel from the pick conveyor to the place conveyor), conveyor systems including only a single robot singulator may not always be capable of providing the necessary throughput required to efficiently process large parcel volumes.
- U.S. Patent Application Publication No. 2021/0395023, which is also incorporated herein by reference, describes another conveyor system, which includes multiple robot singulators (or robots) for transferring parcels from a bulk flow into a singulated stream of parcels. In such a conveyor system, a pick conveyor (which can include any form of chute, conveyor, or conveying surface, whether static or moving, that defines a “picking area”) is configured to receive a bulk flow of parcels, and a place conveyor is positioned downstream of the pick conveyor. A first robot singulator (or first robot) and a second robot singulator (or second robot) work in parallel to transfer parcels within a picking area of the pick conveyor into a singulated stream on the place conveyor in response to instructions from a vision and control subsystem that is operably connected to the pick conveyor, the first robot, and the second robot.
- In any of the above-described conveyor systems, for various reasons, the robots may not be able to engage certain parcels. For example, certain parcels may exceed size and/or weight limitations or otherwise may be characterized as “unconveyable.” In other cases, the vision and control subsystem may not be able to accurately identify a parcel because of a “hidden” edge or other anomaly that makes it difficult to identify the parcel. Thus, there is a need for a rejection mechanism to handle those parcels that cannot be readily transferred from the first conveyor to the second conveyor.
- U.S. Pat. No. 11,014,767, which is also incorporated herein by reference, describes a rejection mechanism for a conveyor system, which pushes parcels across and off of an upper surface of a conveyor. The rejection mechanism includes a linear actuator and a paddle mounted to the linear actuator for movement between a first position and a second position. The paddle includes a bracket portion, an upright portion, and a lateral wall portion. The lateral wall portion is configured to push parcels across a surface positioned below the lateral wall portion as the paddle is moved from the first position to the second position.
- However, such a rejection mechanism may not be suitable for all applications, and thus, there remains a need for improved systems for rejecting parcels that are “unconveyable.”
- The present invention is a trapdoor rejection subsystem for a conveyor system.
- A trapdoor rejection subsystem includes one or more trapdoor rejection mechanisms, with each trapdoor rejection mechanism configured to be selectively transitioned between a closed position and an open position. In use, each respective trapdoor rejection mechanism of the trapdoor rejection subsystem is ordinarily in the closed position to temporarily support parcels directed to the trapdoor rejection mechanism prior to subsequent transfer (e.g., by a robot singulator), but can selectively be transitioned to the open position to cause parcels identified as “unconveyable” to pass through the trapdoor rejection mechanism.
- In some embodiments, each trapdoor rejection mechanism of the trapdoor rejection subsystem includes: a first door mounted to a first shaft; a second door mounted to a second shaft; and one or more actuators which can be selectively actuated to rotate the first shaft and the second shaft, and thus the first door and second door mounted thereto, to transition the trapdoor rejection mechanism between the closed position and the open position.
- In some embodiments, each trapdoor rejection mechanism includes a single actuator. In such embodiments, each trapdoor rejection mechanism further includes a linkage assembly, which interconnects and facilitates simultaneous rotation of the first shaft and the second shaft. The linkage assembly of each trapdoor rejection mechanism includes: a first pivot arm mounted to the first shaft, such that in use, the first shaft is rotated in response to the rotation of the first pivot arm; a second pivot arm mounted to the second shaft, such that, in use, the second shaft is rotated in response to rotation of the second pivot arm; and a rod that connects the first pivot arm to the second pivot arm, such that, in use, rotation of the first pivot arm results in simultaneous rotation of the second pivot arm.
- In some embodiments, each trapdoor rejection mechanism of the trapdoor rejection subassembly includes a frame to which the first shaft and the second shaft are mounted. In some embodiments, the frame defines a wall that partially surrounds the first door and the second door to prevent parcels transferred to the trapdoor rejection mechanism from inadvertently falling off of the trapdoor rejection mechanism. In some embodiments, the first door and the second door of each trapdoor rejection mechanism are positioned opposite of each other so that the first door and the second door move in opposite directions in response to first shaft and the second shaft being rotated in the same rotational direction.
- An exemplary conveyor system, which includes a trapdoor rejection subsystem made in accordance with the present invention, includes: one or more robot singulators; an upstream conveyor for carrying a bulk flow of parcels; one or more trapdoor rejection mechanisms; a place conveyor; and a vision and control subsystem that is operably connected to the one or more robot singulators and the trapdoor rejection mechanism. The vision and control subsystem includes: a camera for acquiring one or more images of a picking area defined by the one or more trapdoor rejection mechanisms and any parcels located in the picking area; and a controller. The controller is configured to receive and process image data corresponding to the one or more images of the picking area acquired by the camera to determine whether a parcel located in the picking area is conveyable or unconveyable. In some implementations, a parcel may be considered to be unconveyable when the parcel in the picking area exceeds certain predetermined dimensions, is of a certain shape, is labeled with certain indicia, and/or has an obstructed edge or other anomaly which makes it difficult for the vision and control subsystem to identify the shape or dimensions of the parcel.
- In response to determining the parcel in the picking area is conveyable, the controller is configured to communicate instructions to the one or more robot singulators which cause the one or more robot singulators to engage and transfer the parcel in the picking area from the picking area to the place conveyor. In response to determining the parcel in the picking area is unconveyable, the controller is configured to communicate instructions which cause one of the trapdoor rejection mechanisms to transition from the closed position to the open position, allowing unconveyable parcel to fall through and effectively removing the unconveyable parcel as a potential candidate for transfer by the one or more robots.
- In some embodiments, a first door of the trapdoor rejection mechanism extends upwardly, and a second door of the trapdoor rejection mechanism extends downwardly, when the trapdoor rejection mechanism is in the open position. In one such embodiment, the trapdoor rejection mechanism is positioned adjacent to a distal end of the upstream conveyor, such that the first door of the trapdoor rejection mechanism defines a wall that blockades parcels from the bulk flow of parcels on the upstream conveyor when the trapdoor rejection mechanism is in the open position.
- In some embodiments, the conveyor system also includes a hinge that is secured to the upstream conveyor and the trapdoor rejection mechanism to bridge a gap between the upstream conveyor and the trapdoor rejection mechanism, preventing parcels from falling through the gap.
- In some embodiments, to alert operators of the conveyor system as to when a parcel is hung (i.e., resting on top) on a door of one of the trapdoor rejection mechanisms when the trapdoor rejection mechanism is in the open position, the conveyor system includes a sensor that is operably connected to the vision and control subsystem. The sensor is positioned to detect the presence of a parcel which has become hung on a door of the trapdoor rejection mechanism and to obtain readings regarding the same. In response to receiving a reading from the sensor indicating the presence of a hung parcel, the controller communicates instructions which cause a display operably connected to the vision and control subsystem to display a visual cue and/or a speaker operably connected to the vision and control subsystem to emit an audible cue. In some embodiments, the sensor is a photoelectric sensor. In some embodiments, the sensor is the camera of the vision and control subsystem.
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FIG. 1 is a perspective view of a conveyor system, including an exemplary trapdoor rejection subsystem made in accordance with the present invention; -
FIG. 2A is a perspective view of a trapdoor rejection mechanism of the exemplary trapdoor rejection subsystem ofFIG. 1 , with the trapdoor rejection mechanism in a closed position; -
FIG. 2B is a perspective view of the trapdoor rejection mechanism similar toFIG. 2A , but with the trapdoor rejection mechanism in an open position; -
FIG. 3 is another perspective view of the trapdoor rejection mechanism similar toFIG. 2A , but with an actuator of the trapdoor rejection mechanism removed; -
FIG. 4 is an alternate perspective view of an upstream conveyor and the exemplary trapdoor rejection subsystem ofFIG. 1 , but with certain components removed; -
FIG. 5 is a sectional view of the upstream conveyor and the exemplary trapdoor rejection subsystem taken along line 5-5 ofFIG. 4 ; and -
FIG. 6 is a schematic diagram of a vision and control subsystem, along with certain components of the conveyor system and the exemplary trapdoor rejection subsystem which may be controlled by the vision and control subsystem and/or provide information to the vision and control subsystem. - The present invention is a trapdoor rejection subsystem for a conveyor system.
-
FIG. 1 is a perspective view of aconveyor system 10, including an exemplarytrapdoor rejection subsystem 100 made in accordance with the present invention. - It is important to recognize that, in the discussion that follows and in the claims of the present application, the term “parcel” is not intended to be limiting and can include any article, item, or object that may be loaded onto the
conveyor system 10 and transferred, rejected, or otherwise processed in the manner specified within the present disclosure. - As shown in
FIG. 1 , the conveyor system 10 generally includes: an upstream conveyor 14 configured to receive and deliver a bulk flow of parcels (not shown), which, in this case, is a bulk feed chute that is split into two sections at its distal end to direct parcels to a first picking area 102 a and a second picking area 102 b that are defined by the trapdoor rejection subsystem 100, as further described below; a place conveyor 16 positioned downstream of the upstream conveyor 14, which, in this case, includes a first place area 16 a, a second place area 16 b, and an buffering conveyor 16 c positioned between the first place area 16 a and the second place area 16 b; a first robot singulator 20 (or first robot 20) and a second robot singulator 22 (or second robot 22), which work in parallel to transfer parcels from the first picking area 102 a and the second picking area 102 b into a singulated stream on the place conveyor 16; and a vision and control subsystem 30 that is operably connected to the first robot 20 and the second robot 22, such that the vision and control subsystem 30 can communicate instructions to control operation of the first robot 20 and the second robot 22, along with other components of the conveyor system 10. - Referring still to
FIG. 1 , theconveyor system 10 further includes the exemplarytrapdoor rejection subsystem 100, which comprises one or moretrapdoor rejection mechanisms trapdoor rejection mechanism trapdoor rejection subsystem 100 is configured to be selectively transitioned (or moved) between a closed position and an open position. In use, each respectivetrapdoor rejection mechanism trapdoor rejection subsystem 100 is ordinarily in the closed position to temporarily support parcels directed to thetrapdoor rejection mechanism upstream conveyor 14 prior to being engaged by thefirst robot 20 or thesecond robot 22 and transferred to theplace conveyor 16. If, however, a particular parcel located on atrapdoor rejection mechanism trapdoor rejection subsystem 100 is identified as “unconveyable,” thetrapdoor rejection mechanism trapdoor rejection mechanism first robot 20 and thesecond robot 22, thus effectively removing the unconveyable parcel as a potential candidate for transfer by thefirst robot 20 or thesecond robot 22. - In some implementations, unconveyable parcels rejected in the foregoing manner may be captured in a temporary storage bin (not shown) or redirected elsewhere via another conveyor (not shown) positioned below the
trapdoor rejection subsystem 100. As further discussed below with reference toFIG. 6 , the detection of “unconveyable” parcels and the transition of eachtrapdoor rejection mechanism trapdoor rejection subsystem 100 may be regulated by the vision and control subsystem 30. - Referring still to
FIG. 1 , thetrapdoor rejection subsystem 100 is positioned directly adjacent to thedistal end 14 a (FIG. 5 ) of theupstream conveyor 14 so that parcels offloaded from theupstream conveyor 14 are directed to thetrapdoor rejection subsystem 100. In this exemplary embodiment, since theupstream conveyor 14 is split into two sections at its distal end, as noted above, thetrapdoor rejection subsystem 100 actually comprises two separate trapdoor rejection mechanisms: a firsttrapdoor rejection mechanism 100 a, which defines thefirst picking area 102 a and is shown in the open position inFIG. 1 ; and a secondtrapdoor rejection mechanism 100 b, which defines thesecond picking area 102 b and is shown in the closed position inFIG. 1 . In some embodiments, thetrapdoor rejection subsystem 100 may be integrated into theupstream conveyor 14 by virtue of eachtrapdoor rejection mechanism trapdoor rejection subsystem 100 either being secured to or integrally formed with theupstream conveyor 14. Furthermore, it should be readily apparent that fewer (one) or more trapdoor rejection mechanisms could be part of thetrapdoor rejection subsystem 100 without departing from the spirit and scope of the present invention. -
FIGS. 2A and 2B are perspective views of the firsttrapdoor rejection mechanism 100 a in the closed position and in the open position, respectively. -
FIG. 3 is a perspective view of the firsttrapdoor rejection system 100 a similar toFIG. 2A , but with anactuator 130 of the firsttrapdoor rejection mechanism 100 a removed to better illustrate other components of the firsttrapdoor rejection mechanism 100 a - Referring now to
FIGS. 2A, 2B, and 3 , the firsttrapdoor rejection mechanism 100 a generally includes afirst door 110, asecond door 120, and one ormore actuators 130 which can be selectively actuated to rotate thefirst door 110 and thesecond door 120 to transition the firsttrapdoor rejection mechanism 100 a between the closed position (FIGS. 2A and 3 ) and the open position (FIG. 2B ). Specifically, in this exemplary embodiment, the firsttrapdoor rejection mechanism 100 a includes two doors: afirst door 110 that is mounted to afirst shaft 112, such that rotation of thefirst shaft 112 results in rotation of thefirst door 110; and asecond door 120 that is mounted to asecond shaft 122, such that rotation of thesecond shaft 122 results in rotation of thesecond door 120. Thus, by rotating thefirst shaft 112 and thesecond shaft 122, thefirst door 110 and thesecond door 120 can be rotated to transition the firsttrapdoor rejection mechanism 100 a between the closed position (FIGS. 2A and 3 ) and the open position (FIG. 2B ). In this regard, in the closed position, thefirst door 110 and thesecond door 120 collectively form a surface in thefirst picking area 102 a, upon which parcels directed off of theupstream conveyor 14 can temporarily rest prior to either being transferred to theplace conveyor 16 or passed through the firsttrapdoor rejection mechanism 100 a as a result of the first trapdoor rejection mechanism being transitioned to the open position. - Referring still to
FIGS. 2A, 2B, and 3 , in this exemplary embodiment, the firsttrapdoor rejection mechanism 100 a further includes aframe 104 to which thefirst shaft 112 and thesecond shaft 122 are mounted via a first pair ofbearings FIGS. 2A, 2B, and 3 ), respectively. To prevent translational movement of thefirst shaft 112 and thesecond shaft 122 while still permitting rotation thereof during operation of the firsttrapdoor rejection mechanism 100 a, in this exemplary embodiment, the first pair ofbearings bearings 108 are pillow block bearings. To support the weight of the various components of the firsttrapdoor rejection mechanism 100 a, theframe 104 may include a set oflegs 104 a (FIG. 1 ) and/or be mounted to another structure, such as theupstream conveyor 14. In this regard, theframe 104, in some implementations, may serve as a convenient point of attachment which facilitates integration of the first trapdoor rejection mechanism intoupstream conveyor 14. To prevent parcels from inadvertently falling off of the firsttrapdoor rejection mechanism 100 a as they are offloaded from theupstream conveyor 14, in this exemplary embodiment theframe 104 defines awall 104 b that partially surrounds thefirst door 110 and thesecond door 120. - Referring still to
FIGS. 2A, 2B, and 3 , in this exemplary embodiment, the firsttrapdoor rejection mechanism 100 a further includes a linkage assembly which interconnects and facilitates simultaneous rotation of thefirst shaft 112 and thesecond shaft 122. The linkage assembly includes: afirst pivot arm 114, asecond pivot arm 124, and arod 126 that interconnects thefirst pivot arm 114 and thesecond pivot arm 124. Thefirst pivot arm 114 is mounted to thefirst shaft 112, such that thefirst shaft 112 is rotated in response to rotation of thefirst pivot arm 114 and vice versa. Similarly, thesecond pivot arm 124 is mounted to thesecond shaft 122, such that thesecond shaft 122 is rotated in response to rotation of thesecond pivot arm 124 and vice versa. Therod 126 is connected to thefirst pivot arm 114 and thesecond pivot arm 124, such that rotation of thefirst pivot arm 114 results in simultaneous rotation of thesecond pivot arm 124, and vice versa. Specifically, in this exemplary embodiment, therod 126 is connected to thefirst pivot arm 114 and thesecond pivot arm 124 so that thefirst pivot arm 114 and thesecond pivot arm 124 simultaneously rotate in the same rotational direction (i.e., clockwise or counterclockwise) as each other. Thefirst door 110 and thesecond door 120 are positioned opposite of each other and mounted to opposing ends of theframe 104, such that the distal edge 110 a of thefirst door 110 and the distal edge 120 a of thesecond door 120 are adjacent to each other, and thefirst shaft 112 and thesecond shaft 122 are parallel to each other. Accordingly, as a result of such construction and the linkage assembly interconnecting thefirst shaft 112 and thesecond shaft 122, rotation of thefirst pivot arm 114 and thesecond pivot arm 124 in the same rotational direction causes thefirst door 110 and thesecond door 120 to move (or open) in different directions, as evidenced by viewingFIGS. 2A and 2B in sequence. Specifically, in this exemplary embodiment, one door moves up while the other door moves down as thefirst shaft 112 and thesecond shaft 122 are rotated in the same rotational direction. - As shown in
FIG. 2B , in this exemplary embodiment, thefirst door 110 is in a vertical, upwardly extending position, and thesecond door 120 is in a vertical, downwardly extending position, when the firsttrapdoor rejection mechanism 100 a is in the open position, the importance of which is further described below. - Referring now specifically to
FIGS. 2A and 2B , in this exemplary embodiment, the firsttrapdoor rejection mechanism 100 a comprises asingle actuator 130, which, in this case, is a gear motor mounted to drive rotation of thefirst pivot arm 114 in two rotational directions (i.e., clockwise and counterclockwise). Accordingly, in this exemplary embodiment, thefirst shaft 112 is operably connected to theactuator 130 via thefirst pivot arm 114. Actuation of theactuator 130 results in rotation of thefirst pivot arm 114, which, of course, causes rotation of thefirst shaft 112 to transition thefirst door 110 from a closed position (FIG. 2A ) to an open position (FIG. 2B ), or vice versa. Furthermore, as a result of the connection of thefirst pivot arm 114 and thesecond pivot arm 124 via therod 126, actuation of theactuator 130 also results in rotation of thesecond pivot arm 124, which, of course, causes rotation of thesecond shaft 122 to transition thesecond door 120 from a closed position (FIG. 2A ) to an open position (FIG. 2B ), or vice versa. Of course, the gear motor is only one of many known actuators that could be used to rotate thefirst shaft 112 and thesecond shaft 122 in the above-described manner. Other suitable actuators include, but are not limited to, pneumatic cylinders, hydraulic cylinders, and/or electric linear actuators. Furthermore, although theactuator 130 is primarily referred to herein as driving rotation of thefirst pivot arm 114, alternative embodiments are contemplated in which theactuator 130 is mounted to drive rotation of thefirst shaft 112 directly - The second
trapdoor rejection mechanism 100 b is of identical construction and thus functions and can be controlled in the same manner as described herein for the firsttrapdoor rejection mechanism 100 a. -
FIG. 6 is a schematic diagram of the vision and control subsystem 30, along with certain components of theconveyor system 10 andtrapdoor rejection subsystem 100 which may be controlled by the vision and control subsystem 30 and/or provide information to the vision and control subsystem 30. - Referring now to
FIGS. 1 and 6 , the vision and control subsystem 30 generally includes: one ormore cameras first picking area 102 a, thesecond picking area 102 b, and any parcels located therein; and acontroller 40. In this exemplary embodiment, the vision and control subsystem 30 includes two cameras: afirst camera 52, which is positioned so that the field of view of thefirst camera 52 includes thefirst picking area 102 a; and asecond camera 54, which is positioned so that the field of view of thesecond camera 54 includes thesecond picking area 102 b. Thefirst camera 52 and thesecond camera 54 are operably connected to thecontroller 40, such that thecontroller 40 can communicate instructions to, and receive image data from, thefirst camera 52 and thesecond camera 54. Thefirst camera 52 and thesecond camera 54 may be selectively activated to capture images of thefirst picking area 102 a and thesecond picking area 102 b, respectively, in response to instructions (or signals) communicated from thecontroller 40 or obtain images substantially continuously. In this exemplary embodiment, the images captured by thefirst camera 52 and thesecond camera 54 are communicated to thecontroller 40 as image data. In other words, the images captured by thefirst camera 52 and thesecond camera 54 are not processed prior to being communicated to thecontroller 40. Embodiments are, however, contemplated in which thefirst camera 52 and thesecond camera 54 are individual components of one or more larger vision units, as disclosed, for example, in U.S. Patent Application Publication No. 2021/0395023, which, again, is incorporated herein by reference. In such embodiments, the images acquired by thefirst camera 52 and thesecond camera 54 may be processed locally on one or more vision units to generate the image data which is subsequently communicated to thecontroller 40 for processing. Suitable cameras for use in the vision and control subsystem 30 include three-dimensional image sensors manufactured and distributed by ifm Effector Inc. of Malvern, Pa. - Referring still to
FIGS. 1 and 6 , thecontroller 40 includes aprocessor 42 configured to execute instructions stored in amemory component 44 or other computer-readable medium. In this exemplary embodiment, thecontroller 40 is a programmable logic controller or other industrial controller. Thecontroller 40 is connected to thefirst camera 52 and thesecond camera 54 to facilitate the transmission of image data from thefirst camera 52 and thesecond camera 54 to thecontroller 40 either by wired connection (e.g., Ethernet connection) or by wireless connection (e.g., via a network) using known interfaces and protocols. The image data received from thefirst camera 52 and thesecond camera 54 is processed by thecontroller 40 to determine whether a parcel located in the picking area to which the image corresponds is “unconveyable” and should be removed as a candidate for transfer by thefirst robot 20 or thesecond robot 22. In this exemplary implementation, a parcel is considered to be “unconveyable” when the parcel exceeds certain predetermined dimensions, is of a certain shape, is labeled with certain indicia, and/or has an obstructed (or “hidden”) edge or other anomaly which makes it difficult for the vision and control subsystem 30 to identify the shape or dimensions of the parcel. It is appreciated, however, that the criteria by which a parcel is deemed “unconveyable” may be modified to better accommodate different sorting applications and/or environments without departing from the spirit and scope of the present invention. - Referring still to
FIGS. 1 and 6 , thecontroller 40 is also operably connected to theactuators trapdoor rejection mechanism 100 a and the secondtrapdoor rejection mechanism 100 b, such that theactuator 130 of the firsttrapdoor rejection mechanism 100 a and theactuator 132 of the secondtrapdoor rejection mechanism 100 b can be selectively actuated in response to instructions (or signals) communicated from thecontroller 40. Upon determining a parcel located in thefirst picking area 102 a is unconveyable, thecontroller 40 communicates instructions to the firsttrapdoor rejection mechanism 100 a which actuates theactuator 130 of the firsttrapdoor rejection mechanism 100 a and transitions the firsttrapdoor rejection mechanism 100 a to the open position. Similarly, upon determining a parcel located in thesecond picking area 102 b is unconveyable, thecontroller 40 communicates instructions to the secondtrapdoor rejection mechanism 100 b which actuates theactuator 132 of the secondtrapdoor rejection mechanism 100 b and transitions the secondtrapdoor rejection mechanism 100 b to the open position. If, however, the parcel in thefirst picking area 102 a and the parcel located in thesecond picking area 102 b are not determined to be unconveyable (i.e., a determination that the parcel is conveyable), the vision and control subsystem 30 communicates instructions to either thefirst robot 20 or the second robot to 22 to transfer such parcels to thefirst place area 16 a or the second place area 16 b of theplace conveyor 16. - Referring again to
FIG. 1 , in this example embodiment, theplace conveyor 16 is actually comprised of multiple conveyors, each of which can be selectively activated to transfer singulated parcels downstream for subsequent processing. Specifically, in this exemplary embodiment, theplace conveyor 16 includes: a first conveyor which defines thefirst place area 16 a; a second conveyor which defines the second place area 16 b; and a third (or buffering)conveyor 16 c positioned between the first conveyor and the second conveyor. The bufferingconveyor 16 c can be selectively activated to regulate the rate at which parcels offloaded from thefirst place area 16 a are subsequently transferred to the second place area 16 b. - Referring again to
FIG. 6 , as noted above, in this exemplary embodiment, thecontroller 40 is also operably connected to thefirst robot 20 and thesecond robot 22, such that thecontroller 40 can communicate instructions (or signals) to control operation of thefirst robot 20 and thesecond robot 22. Although not shown inFIG. 6 , thecontroller 40 may also be operably connected to thebuffering conveyor 16 c, such that thecontroller 40 can communicate instructions (or signals) to control operation of thebuffering conveyor 16 c. -
FIG. 4 is an alternate perspective view of anupstream conveyor 14 and the exemplarytrapdoor rejection subsystem 100 ofFIG. 1 , but theplace conveyor 16, thefirst robot singulator 20, thesecond robot singulator 22, and the framework supporting thefirst robot singulator 20 and thesecond robot singulator 22 have been removed to better illustrate other components of thetrapdoor rejection subsystem 100. -
FIG. 5 is a sectional view of the upstream conveyor and the exemplary trapdoor rejection subsystem taken along line 5-5 ofFIG. 4 . - Referring now to
FIGS. 1, 4, and 5 , in this exemplary embodiment, the firsttrapdoor rejection mechanism 100 a and the secondtrapdoor rejection mechanism 100 b are positioned so that thefirst door 110 of eachtrapdoor rejection mechanism distal end 14 a of theupstream conveyor 14. As a result of such orientation, when the firsttrapdoor rejection mechanism 100 a or the secondtrapdoor rejection mechanism 100 b is transitioned to the open position, thefirst door 110 is in a vertical, upwardly extending position which effectively defines a wall that blockades and prevents upstream parcels located on theupstream conveyor 14 from inadvertently transitioning off of theupstream conveyor 14 and through thetrapdoor rejection subsystem 100. As a further result of such orientation, when the firsttrapdoor rejection mechanism 100 a or the secondtrapdoor rejection mechanism 100 b is transitioned to the open position, thesecond door 120 of the mechanism is in a vertical, downwardly extending position, which prevents an unconveyable parcel from inadvertently being catapulted onto theplace conveyor 16. - Referring again to
FIGS. 1 and 6 , following the transition of the firsttrapdoor rejection mechanism 100 a to the open position, thecontroller 40 communicates instructions (or signals) which actuate theactuator 130 to return the firsttrapdoor rejection mechanism 100 a back to the closed position so that upstream parcels subsequently directed to thefirst picking area 102 a from theupstream conveyor 14 can be transferred to theplace conveyor 16 or rejected in the above-described manner. Similarly, following the transition of the secondtrapdoor rejection mechanism 100 b to the open position, thecontroller 40 communicates instructions (or signals) which actuate theactuator 132 of the secondtrapdoor rejection mechanism 100 b to return the secondtrapdoor rejection mechanism 100 b to the closed position so that upstream parcels subsequently directed to thesecond picking area 102 b from theupstream conveyor 14 can be transferred to theplace conveyor 16 or rejected in the above-described manner. The communication of instructions (or signals) by thecontroller 40 to return the firsttrapdoor rejection mechanism 100 a or the secondtrapdoor rejection mechanism 100 b to the closed position may occur automatically (e.g., after a predetermined time period after being transitioned to the open position) or after a verification step performed by the vision and control subsystem 30, as further described below. - As evidenced by the second
trapdoor rejection mechanism 100 b inFIG. 4 , as thefirst door 110 of each respectivetrapdoor rejection mechanism first door 110. As the respectivetrapdoor rejection mechanisms first door 110 may inadvertently fall below thetrapdoor rejection subsystem 100 or prevent thefirst door 110 and thesecond door 120 from closing correctly. Therefore, prior to communicating instructions to transition the firsttrapdoor rejection mechanism 100 a or the secondtrapdoor rejection mechanism 100 b back to the closed position, the vision and control subsystem 30 preferably verifies that no parcels are hung and that the doors of the respectivetrapdoor rejection mechanisms conveyor system 10 further includes a sensor 150 (FIGS. 1 and 6 ), such as a photoelectric sensor, to detect when a parcel becomes hung in the above-described manner. Thesensor 150 is configured and positioned to detect instances in which a parcel rests on top of thefirst door 110 of the respectivetrapdoor rejection mechanisms trapdoor rejection mechanism single sensor 150 is shown in the drawings. Accordingly, in this exemplary embodiment, thesensor 150 actually comprises multiple sensors that are distributed throughout theconveyor system 10. In an alternative embodiment, instead of a photoelectric sensor, thesensor 150 comprises one ormore cameras - Referring now specifically to
FIG. 6 , as shown, thesensor 150 is operably connected to the vision and control subsystem 30, such that readings obtained by thesensor 150 are transmitted to acontroller 40 of the vision and control subsystem 30 for subsequent processing. Thesensor 150 may be selectively activated to obtain readings in response to instructions (or signals) communicated from thecontroller 40 of the vision and control subsystem 30 or obtain readings substantially continuously. In the event readings from thesensor 150 are determined by thecontroller 40 to indicate that a parcel is hung on one of the respectivetrapdoor rejection mechanisms conveyor system 10, thecontroller 40 is configured to generate an alarm to notify an operator of such occurrence. In this exemplary embodiment, the alarm generated by thecontroller 40 is in the form of a visual cue which is displayed on adisplay 170 that is operably connected to thecontroller 40 of the vision and control subsystem 30 and/or an audible cue which is emitted from aspeaker 160 that is operably connected to thecontroller 40 of the vision and control subsystem 30. To verify that thetrapdoor rejection mechanism controller 40 preferably waits to communicate instructions to theactuator trapdoor rejection mechanism controller 40 receives a reading from thesensor 150 indicating that the parcel is no longer hung. - Referring now again to
FIGS. 1, 4, and 5 , in this exemplary embodiment, theconveyor system 10 further includes ahinge 15 a, 15 b which bridges a gap 17 (FIG. 5 ) existing between thedistal end 14 a of theupstream conveyor 14 and thetrapdoor rejection subsystem 100 to prevent smaller parcels (e.g., flat envelops) from falling through thegap 17 during operation of theconveyor system 10. In this exemplary embodiment, thehinge 15 a, 15 b actually comprises two separate hinges: afirst hinge 15 a which is secured to and extends between thedistal end 14 a of theupstream conveyor 14 and the firsttrapdoor rejection mechanism 100 a; and a second hinge 15 b which is secured to and extends between thedistal end 14 a of theupstream conveyor 14 and the secondtrapdoor rejection mechanism 100 b. As best shown inFIG. 5 , in this exemplary embodiment, thefirst hinge 15 a is secured to an underside of thedistal end 14 a of theupstream conveyor 14 and thefirst door 110 of the firsttrapdoor rejection mechanism 100 a. Although not shown, the second hinge 15 b is similarly secured with respect to thedistal end 14 a of the upstream conveyor and the secondtrapdoor rejection mechanism 100 b. In this exemplary embodiment, the length of thefirst hinge 15 a and the second hinge 15 b, in combination, is coextensive with the length of thegap 17 existing between thedistal end 14 a of theupstream conveyor 14 and thetrapdoor rejection subsystem 100. Alternative embodiments are, however, contemplated in which the length of thefirst hinge 15 a and the second hinge 15 b, in combination, only extends a portion of the length of thegap 17, while still effectively preventing parcels from falling through thegap 17. Various hinge types and constructions may be utilized for thefirst hinge 15 a and the second hinge 15 b. For example, as shown inFIGS. 4 and 5 , in this exemplary embodiment, thefirst hinge 15 a and the second hinge 15 b are comprised of multiple interlocking segments which define a plurality of joints that may be manipulated as thetrapdoor rejection mechanism first hinge 15 a and the second hinge 15 b may be constructed of a rigid plastic or flexible rubber. In alternative embodiments, thefirst hinge 15 a and the second hinge 15 b may be constructed in a similar manner to the transfer plate that is described in U.S. Pat. No. 10,654,652, which is incorporated herein by reference. - Although the exemplary embodiments described above with reference to
FIGS. 1, 2A, 2B, and 3-6 describes the incorporation of thetrapdoor rejection subsystem 100 of the present invention into a conveyor system that makes use of first and second six-axis robots, the invention is not limited to such a configuration. Rather, thetrapdoor rejection subsystem 100 of the present invention could be incorporated into various other conveyor systems, including conveyor systems which utilize only a single robot singulator, without departing from the spirit or scope of the present invention. Suitable, alternative conveying systems in which thetrapdoor rejection subsystem 100 may be incorporated include, but is not limited to, the conveyor system described in U.S. Pat. No. 10,646,898 (which uses a single robot for singulation). Additionally, although thetrapdoor rejection subsystem 100 is primarily referred to herein in the context of comprising multipletrapdoor rejection mechanisms trapdoor rejection subsystem 100 may include only a single trapdoor rejection mechanism and still fall within the spirit and scope of the present invention. Furthermore, although theupstream conveyor 14 is sometimes referred to herein and illustrated within the drawings as a bulk feed chute, it should be appreciated that theupstream conveyor 14 is not so limited. Rather, in some embodiments, instead of a bulk feed chute, theupstream conveyor 14 comprises a different conveying mechanism, such as one or more belt or roller conveyors. - One of ordinary skill in the art will recognize that additional embodiments and implementations are also possible without departing from the teachings of the present invention. This detailed description, and particularly the specific details of the exemplary embodiment and implementation disclosed herein, is given primarily for clarity of understanding, and no unnecessary limitations are to be understood therefrom, for modifications will become obvious to those skilled in the art upon reading this disclosure and may be made without departing from the spirit or scope of the invention.
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